package/libgpiod: disable examples

package/libgpiod: disable examples

This will fix a build failure with libgpiod in version 1.6.2

Even though the examples are not built by default, we explicitly
disable them, to be future-proof in case that default changes in
the future.

Fixes:
 - http://autobuild.buildroot.org/results/321004b185213099c7c5633b5ec35ceadd0293bc

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[yann.morin.1998@free.fr:
  - keep dependencies first
  - explicitly disable examples
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>